Method and device for determining well group single well control reserves through five-point method

Abstract

The invention discloses a five-point method well group single well control reserve determination method and device. The method comprises the steps that a production well and an injection well in a five-point method well group serve as a research unit, two rays are drawn with the production well and the injection well as vertexes respectively, and the included angle between each ray and the connecting line of the production well and the injection well is half of a preset angle; determining a rhombic range by taking two intersection points of the four rays and the production well and the injection well as vertexes, and taking the rhombic range as a fluid flow range controlled by the production well in the research unit to obtain a fluid flow range controlled by the production well in the well group; and according to the lower limit of the seepage conditions and the controlled fluid flowing range of the production well in the well group, the single-well controlled reserves of the production well in the well group are determined. According to the method, the five-point method well group single well control reserves can be quickly and conveniently determined by using extremely few data.

Description

Technical Field

[0001] This invention relates to the field of reservoir engineering technology, and in particular to a method and apparatus for determining the controlled reserves of a single well in a five-point well group. Background Technology

[0002] The controlled reserves of a single well are the most widely used and important basic data in single-well analysis and well group analysis. They are important geological parameters for the formulation and adjustment of oilfield development plans and are directly related to the economic benefits of oilfield development.

[0003] The main methods for determining the controlled reserves of a single well are: (1) Based on well test data, the drainage area of ​​the oil well is determined using the pressure recovery curve, and then the controlled reserves of the single well are calculated; (2) Based on the relationship between the formation pressure and cumulative oil production measured by drill pipe testing, the controlled reserves of a single well are determined by the principle of material balance; (3) Based on relative permeability and oil production index data, the relative permeability decline rate and the oil production index decline rate are calculated respectively. When the sum of the squares of the differences between the two is minimized, the controlled reserves of the single well can be determined; (4) Based on daily oil production and cumulative oil production... As well as dynamic data such as original reservoir pressure and bottom hole flowing pressure, starting from the quasi-steady-state seepage equation, the single well controlled reserves can be obtained by linear regression and extrapolation; (5) According to the saturated pressure distribution in the numerical simulation calculation results, calculate the pressure gradient between the grid block and the surrounding four wells, and then determine the grid controlled by the single well according to the pressure gradient. The geological reserves of the grid block controlled by each well are accumulated in sequence, which is the controlled reserves of the well; (6) According to the distribution of sand body type, the triangular network method is used to calculate the single well controlled area, and then the single well controlled reserves are calculated. Summary of the Invention

[0004] The inventors discovered during their work that the existing techniques for determining single-well controlled reserves, although also called single-well controlled reserves, actually address the geological reserves of sand body types controlled by a single well. They solve the problem of uneven distribution of sand body types and well points in calculating geological reserves of different sand body types using the "thickness leveling method," but do not truly address the geological reserves within the fluid flow range controlled by a single well. Furthermore, in the high-water-cut and ultra-high-water-cut development stages of multi-layer sandstone oilfields, the calculation of single-well controlled reserves during the densification and adjustment of the five-point well network used to further improve recovery rates is hampered by the complexity of the exploited strata and the presence of multiple well network combinations. Either pressure test data or production dynamic data are lacking, or even if such data exists, it is often incomplete (not available for every five-point well group or every sedimentary unit). Therefore, it is impossible to calculate single-well controlled reserves using pressure test data or production dynamic data. While numerical simulation can calculate the controlled reserves of a single well, it requires a large amount of input data and takes a long time, making it difficult to perform single-well controlled reserve calculations quickly and readily, thus failing to meet the needs of single-well controlled reserve analysis in reservoir engineering.

[0005] To enrich the process routes and increase the selection space, this invention provides a method and apparatus for determining the controlled reserves of a single well in a five-point well group, which can quickly and conveniently determine the controlled reserves of a single well in a five-point well group using very little data.

[0006] In a first aspect, embodiments of the present invention provide a method for determining the controlled reserves of a single well in a five-point well group, comprising:

[0007] Taking one production well and one injection well in the five-point well group as a research unit, two rays are drawn with the production well and the injection well as vertices respectively. The angle between each ray and the line connecting the production well and the injection well is half of a preset angle. A rhomboid range is determined with the two intersection points of the four rays and the production well and the injection well as vertices. This range is taken as the fluid flow range controlled by the production well in the research unit, and the fluid flow range controlled by the production well in the well group is obtained.

[0008] Based on the lower limit of seepage conditions and the fluid flow range controlled by the production well within the well group, the single-well controlled reserves of the production well in the well group are determined.

[0009] Secondly, embodiments of the present invention provide a device for determining the controlled reserves of a single well in a five-point well group, comprising:

[0010] The fluid flow range determination module is used to take one production well and one injection well in a five-point well group as a research unit. Two rays are drawn with the production well and the injection well as vertices respectively. The angle between each ray and the line connecting the production well and the injection well is half of a preset angle. A rhomboid range is determined with the two intersection points of the four rays and the production well and the injection well as vertices. This range is used as the fluid flow range controlled by the production well in the research unit, thus obtaining the fluid flow range controlled by the production well in the well group.

[0011] The controlled reserves determination module is used to determine the single-well controlled reserves of each well in the well group based on the lower limit of seepage conditions and the fluid flow range controlled by the producing well within the well group.

[0012] Thirdly, embodiments of the present invention provide a computer storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-mentioned method for determining the controlled reserves of a single well in a five-point well group.

[0013] Fourthly, this disclosure provides a server, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-mentioned method for determining the controlled reserves of a single well in a five-point well group.

[0014] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0015] The five-point method for determining the controlled reserves of a single well in a well group, as provided in this invention, treats one production well and one injection well within the five-point well group as a research unit, approximating its streamline field range as a rhombus. Based on a pre-determined rhombus angle and seepage condition limit, only the location information of each well within the five-point well group and easily obtainable distribution data of parameters such as porosity, permeability, and saturation of each flow unit are needed to quickly and conveniently determine the controlled reserves of a single well in the five-point well group. Furthermore, the rhombus approximation of the streamline field range fully meets the accuracy requirements for single-well controlled reserve analysis in reservoir engineering. This method solves the problem of insufficient or incomplete pressure test data and production dynamics during the development phase of multi-layer sandstone oilfields with high and ultra-high water cut, requiring the calculation of controlled reserves; it also solves the problem of long simulation times and difficulty in quickly calculating single-well controlled reserves in reservoir numerical simulation calculations; and it addresses the issue that the single-well controlled reserves (single-well controlled sand body type geological reserves) determined by existing technologies are not necessarily the geological reserves of the single-well controlled fluid flow range.

[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the streamline field distribution of the five-point well group in an embodiment of the present invention;

[0020] Figure 2 This is a flowchart of the method for determining the controlled reserves of a single well in a five-point well group according to Embodiment 1 of the present invention;

[0021] Figure 3 This is a flowchart illustrating the specific implementation of the five-point method for determining the controlled reserves of a single well in a well group according to Embodiment 2 of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the five-point method well group single-well controlled reserve determination device in an embodiment of the present invention. Detailed Implementation

[0023] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0024] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0025] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0026] In the high-water-cut and ultra-high-water-cut development stages of multi-layer sandstone oilfields, the well network densification employed to further enhance oil recovery is typically a five-point well network, composed of multiple five-point well groups. A typical five-point well group includes a central injection well and four surrounding production wells. (See [link to documentation]). Figure 1 As shown; or, the five-point well group includes a central production well and four surrounding injection wells. The above two scenarios represent the standard setup for a five-point well group. Optionally, other well placement methods can also be used for the five-point well group; this embodiment does not limit the specific method used.

[0027] Based on the concept of single-well controlled reserves—the geological reserves within the controlled fluid flow range of a single well—numerical simulations of multiple five-point well groups revealed that the streamline field distribution exhibits a "petal-like" characteristic. (See [link to relevant documentation]). Figure 1 As shown, a production well and an injection well within a five-point well group are taken as a research unit, and its streamline field envelope includes two symmetrical arc segments.

[0028] From a mathematical perspective, the region enclosed by two symmetrical arcs is not easy to quantify, the area is not easy to calculate, and it is not easy to average. Therefore, in order to simplify the calculation, this embodiment approximates the region enclosed by two symmetrical arcs, that is, the envelope of the flow field line of each research unit, as a rhomboid region while meeting the requirements of calculation accuracy.

[0029] Based on numerical simulation results of multiple five-point well groups within the target reservoir, the streamline field envelope of each study unit within each five-point well group was obtained. For the streamline field envelope of each study unit, a rhombus was determined with the produced well and the injection well within the study unit as its two opposite vertices. The area difference between the rhombus and the envelope did not exceed a set area difference threshold. The average value of the acute angle of the rhombus was obtained. In subsequent studies of other five-point well groups within the target reservoir, to avoid the diversification of data required for numerical simulation and excessively long model time, this average value was determined as the acute angle of the approximate rhombus of the streamline field of each study unit in the five-point well groups that were not numerically simulated, facilitating subsequent calculations.

[0030] Specifically, how to determine a rhombus with the production well and the injection well as its two opposite vertices, such that the area difference between it and the envelope does not exceed a set area difference threshold, can be determined manually by geologists or after precise mathematical calculations. This embodiment does not limit the specific determination method.

[0031] In addition to determining the acute angle of the approximate rhombus shape of the streamline field envelope of the research unit mentioned above, the preparatory work required for this embodiment also requires comprehensively determining the seepage condition limit based on the perforation situation of the production wells in the target reservoir, geological characteristics, fluid properties, and other static and dynamic conditions.

[0032] Specifically, the lower limit of seepage conditions includes both the lower limit of porosity and the lower limit of permeability. That is, only areas where both porosity and permeability exceed the lower limit of porosity can potentially be considered single-well reserve control areas. Optionally, the lower limit of seepage conditions may also include the lower limit of effective thickness, etc.

[0033] To address the challenge of calculating controlled reserves per well in multi-layered sandstone oilfields during the high and ultra-high water-cut development phase due to incomplete data, making it impossible to use test data or production dynamic data for single-well controlled reserve calculation, and hindering the timely implementation of numerical simulation calculations for single-well controlled reserves, this invention provides a method and apparatus for determining single-well controlled reserves in a five-point well network. This method enables rapid and convenient determination of single-well controlled reserves in a five-point well network using minimal data. The method and apparatus provided in this embodiment are particularly suitable for the high and ultra-high water-cut development phase of multi-layered sandstone oilfields, enabling real-time and rapid calculation of single-well controlled reserves in a denser five-point well network designed to further enhance oil recovery.

[0034] Example 1

[0035] Embodiment 1 of the present invention provides a method for determining the controlled reserves of a single well in a well group using the five-point method, the process of which is as follows: Figure 2 As shown, it includes the following steps:

[0036] Step S21: Taking one production well and one injection well in the five-point well group as a research unit, draw two rays with the production well and the injection well as vertices respectively. The angle between each ray and the line connecting the production well and the injection well is half of the preset angle. Use the two intersection points of the four rays and the production well and the injection well as vertices to determine a rhomboid range, which is the fluid flow range controlled by the production well in the research unit, and obtain the fluid flow range controlled by the production well in the well group.

[0037] Specifically, the aforementioned preset angle is the average acute angle of the approximate rhombus shape of the streamline field envelope of the research unit within the reservoir where the five-point well group is located, determined by the method described above.

[0038] In some embodiments, the well group boundary is determined based on the relationship between the injection wells and the production wells in the well group, and it is determined whether the two intersection points of the four rays are within the well group boundary. If so, a rhombus range can be determined directly using the two intersection points of the four rays, the production well, and the injection well as vertices; if not, if the production well is located at the edge of the well group, a rhombus range is determined using the midpoints between the production well and each of the other two adjacent wells, as well as the production well and the injection well as vertices; if the injection well is located at the edge of the well group, a rhombus range is determined using the midpoints between the injection well and each of the other two adjacent wells, as well as the production well and the injection well as vertices.

[0039] by Figure 1 For example, if the research unit consists of production well 1 and injection well, and if the two intersection points of the four rays are not within the boundary of the well group, then the midpoint between production well 1 and production well 2, the midpoint between production well 1 and production well 3, and production well 1 and injection well are taken as the four vertices to determine the rhombus range.

[0040] The five-point well group consists of four study units. After the fluid flow range controlled by the production wells in the four study units is determined, for each production well in the well group (there may be only one), the sum of the fluid flow range controlled by the production well in each study unit is determined as the fluid flow range controlled by that production well in the well group.

[0041] Step S22: Determine the single-well controlled reserves of the production well within the well group based on the lower limit of seepage conditions and the fluid flow range controlled by the production well within the well group.

[0042] Based on the physical property distribution characteristics of each flow unit, and according to the lower limit of seepage conditions and the fluid flow range controlled by the production well in the well group, the reserve control range of the production well in each flow unit is determined. The controlled reserves of the production well in each flow unit are determined by the volumetric method, and the single-well controlled reserves of the production well in the well group are obtained.

[0043] The method for determining the controlled reserves of a single well in a five-point well group provided in Embodiment 1 of this invention treats one production well and one injection well within a five-point well group as a research unit, approximating its streamline field range as a rhombus. Based on a pre-determined rhombus angle and seepage condition limit, only the location information of each well within the five-point well group and easily obtainable distribution data of parameters such as porosity, permeability, and saturation content of each flow unit are needed to quickly and conveniently determine the controlled reserves of a single well in the five-point well group. Furthermore, the rhombus approximation of the streamline field range fully meets the accuracy requirements for single-well controlled reserve analysis in reservoir engineering. This method solves the problem of insufficient or incomplete pressure test data and production dynamics during the development phase of multi-layer sandstone oilfields with high and ultra-high water cut, requiring the calculation of controlled reserves; it also solves the problem of long simulation times and difficulty in quickly calculating single-well controlled reserves in reservoir numerical simulation calculations; and it addresses the issue that the single-well controlled reserves (single-well controlled sand body type geological reserves) determined by existing technologies are not necessarily the geological reserves of the single-well controlled fluid flow range.

[0044] Example 2

[0045] Embodiment 2 of the present invention provides a specific implementation flow of the five-point method for determining the controlled reserves of a single well in a well group, referring to... Figure 3 As shown, it includes the following steps:

[0046] Step S31: Establish a database for calculating the controlled reserves of a single well.

[0047] Based on the research block's fine-grained layer database, sedimentary unit layer database, sedimentary unit reservoir database, oil bottom and water top database, and coordinate database, a database for calculating single-well controlled reserves was formed. This database contains relevant information for calculating single-well controlled reserves, including well name, horizontal and vertical coordinates, sand body type, thickness level, porosity, permeability, and original content saturation for each sedimentary unit.

[0048] Step S32: Determine the boundary of the five-point well group.

[0049] Based on the relationship between injection wells and production wells, the boundaries of each five-point well group in the study block are determined.

[0050] Step S33: Determine the fluid flow range controlled by the production well in the five-point well group.

[0051] The specific determination process is described in Example 1.

[0052] Step S34: Calculate the single-well controlled reserves of each producing well in a five-point well group.

[0053] Within the fluid flow range, the seepage conditions of fluid flow in each sedimentary unit are first determined—the lower limits of effective thickness and permeability. Then, the geological reserves of different flow units controlled by each production well are calculated using the single-well area method (a method that uses the triangular network method to determine the single-well area and then uses the volume method to calculate the reserves). The reserves controlled by each production well in the five-point method well group are then accumulated to obtain the single-well controlled reserves of the production wells.

[0054] Step S35: Accumulate the total controlled reserves of each producing well.

[0055] After calculating the controlled reserves of each producing well within each five-point well group using the above method, the total controlled reserves of each producing well are obtained by summing them up. Optionally, the well-controlled geological reserves of each flow unit and the well-controlled geological reserves of the entire study block can also be obtained by summing them up.

[0056] Using the method of this invention, the controlled reserves of individual wells in 10 well groups and 5 sedimentary units in a development block of an oilfield in eastern my country were calculated. An effective thickness of 0.2 meters and a permeability of 0.05 μm were used. 2 Using a maximum streamline angle of 65 degrees for both injection and production wells as a control condition, the controlled reserves of each well were calculated. Partial results are shown in Table 1. These calculations are more reliable than those using the "single-well controlled reserves method for different types of sand bodies," providing a geological reserve basis for further polymer injection to enhance oil recovery in this block.

[0057] Table 1. Controlled reserves of a single well in a development block of an oilfield in eastern China (partial) Unit: 10 4 t

[0058]

[0059] Based on the inventive concept of this invention, embodiments of this invention also provide a device for determining the controlled reserves of a single well in a five-point well group, the structure of which is as follows: Figure 4 As shown, it includes:

[0060] The fluid flow range determination module 41 is used to take one production well and one injection well in the five-point well group as a research unit, draw two rays with the production well and the injection well as vertices respectively, and the angle between each ray and the line connecting the production well and the injection well is half of a preset angle. The two intersection points of the four rays and the production well and the injection well are used as vertices to determine a rhomboid range, which is the fluid flow range controlled by the production well in the research unit, and the fluid flow range controlled by the production well in the well group is obtained.

[0061] The controlled reserves determination module 42 is used to determine the single-well controlled reserves of the produced well in the well group based on the seepage condition limit and the fluid flow range controlled by the produced well in the well group.

[0062] In some embodiments, the fluid flow range determination module 41, which defines a rhomboid range using the two intersections of the four rays and the production well and injection well as vertices, is also used for:

[0063] Determine whether the two intersection points of the four rays are within the well group boundary, which is determined based on the relationship between the injection wells and production wells in the well group. If yes, a rhombus-shaped range is determined using the two intersection points of the four rays, the production well, and the injection well as vertices. If no, if the production well is located at the edge of the well group, a rhombus-shaped range is determined using the midpoints between the production well and each of the other two adjacent wells, as well as the production well and the injection well as vertices. If the injection well is located at the edge of the well group, a rhombus-shaped range is determined using the midpoints between the injection well and each of the other two adjacent wells, as well as the production well and the injection well as vertices.

[0064] In some embodiments, the above-described apparatus further includes a streamline field angle determination module 43, configured to:

[0065] Based on the numerical simulation results of multiple five-point well groups within the reservoir where the five-point well group is located, the streamline field envelope of each research unit within the multiple five-point well groups is obtained. The envelope includes two symmetrical arc segments. For the streamline field envelope of each research unit, a rhombus is determined with the production well and injection well within the research unit as the two opposite vertices. The area difference between the rhombus and the envelope does not exceed a set area difference threshold. The average value of the acute angles of the obtained rhombus is determined as the preset angle.

[0066] In some embodiments, the fluid flow range determination module 41, which obtains the fluid flow range controlled by the produced well within the well group, is used for:

[0067] Identify all research units within the well group that contain the same production well; determine the sum of the fluid flow ranges controlled by the production well within each research unit as the fluid flow range controlled by the production well within the well group.

[0068] In some embodiments, the controlled reserve determination module 42, which determines the single-well controlled reserves of the produced well within the well group based on the seepage condition limit and the fluid flow range controlled by the produced well within the well group, is used for:

[0069] Based on the physical property distribution characteristics of each flow unit, and according to the lower limit of seepage conditions and the fluid flow range controlled by the production well in the well group, the reserve control range of the production well in each flow unit is determined. The controlled reserves of the production well in each flow unit are determined by the volumetric method, and the single-well controlled reserves of the production well in the well group are obtained.

[0070] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0071] Based on the inventive concept of the present invention, the embodiments of the present invention also provide a computer storage medium, wherein the computer storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the above-mentioned method for determining the controlled reserves of a single well in a five-point well group is implemented.

[0072] Based on the inventive concept of this invention, this embodiment of the invention also provides a server, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the above-mentioned method for determining the controlled reserves of a single well in a five-point well group.

[0073] Unless otherwise specifically stated, terms such as processing, calculation, operation, determination, display, etc., may refer to the actions and / or processes of one or more processing or computing systems or similar devices that represent the manipulation and conversion of data representing physical (e.g., electronic) quantities within the registers or memory of the processing system into other data similarly representing physical quantities within the memory, registers, or other such information storage, transmission, or display devices of the processing system. Information and signals can be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0074] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0075] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than those stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby clearly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the invention.

[0076] Those skilled in the art will also understand that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments herein can be implemented as electronic hardware, computer software, or a combination thereof. To clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above are generally described in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art can implement the described functionality in alternative ways for each specific application; however, such implementation decisions should not be construed as departing from the scope of this disclosure.

[0077] The steps of the methods or algorithms described in conjunction with the embodiments herein can be directly embodied in hardware, software modules executed by a processor, or a combination thereof. The software modules can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. The ASIC can reside in a user terminal. Alternatively, the processor and storage medium can exist as discrete components in the user terminal.

[0078] For software implementation, the techniques described in this application can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described in this application. This software code can be stored in memory units and executed by a processor. The memory units can be implemented within the processor or outside the processor; in the latter case, they are communicatively coupled to the processor via various means, as is well known in the art.

[0079] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A method for determining the controlled reserves of a single well in a five-point well group, characterized in that, include: Taking one production well and one injection well in the five-point well group as a research unit, two rays are drawn with the production well and the injection well as vertices respectively. The angle between each ray and the line connecting the production well and the injection well is half of a preset angle. A rhomboid range is determined with the two intersection points of the four rays and the production well and the injection well as vertices. This range is taken as the fluid flow range controlled by the production well in the research unit, and the fluid flow range controlled by the production well in the well group is obtained. Based on the lower limit of seepage conditions and the fluid flow range controlled by the production well within the well group, the single-well controlled reserves of the production well within the well group are determined.

2. The method as described in claim 1, characterized in that, The method of defining a rhomboid range using the two intersection points of the four rays, the production well, and the injection well as vertices also includes: Determine whether the two intersection points of the four rays are within the well group boundary, which is determined based on the relationship between the injection wells and the production wells in the well group; If so, a rhombus-shaped area is defined by taking the two intersection points of the four rays and the production well and injection well as the vertices; If not, if the production well is located at the edge of the well group, a rhombus-shaped range is defined with the midpoint between the production well and each of the other two adjacent wells, as well as the production well and the injection well, as the vertices; if the injection well is located at the edge of the well group, a rhombus-shaped range is defined with the midpoint between the injection well and each of the other two adjacent wells, as well as the production well and the injection well, as the vertices.

3. The method as described in claim 1, characterized in that, The preset angle is determined in the following manner: Based on the numerical simulation results of multiple five-point well groups in the reservoir where the five-point well group is located, the streamline field envelope of each research unit in the multiple five-point well groups is obtained, and the envelope includes two symmetrical arc segments. For the streamline field envelope of each research unit, a rhombus is determined with the produced well and the injected well in the research unit as the two opposite vertices. The area difference between the rhombus and the envelope does not exceed the set area difference threshold. The average value of the obtained acute angles of the rhombus is determined as the preset angle.

4. The method as described in claim 1, characterized in that, The fluid flow range controlled by the production well within the well group includes: The study units within the well group are identified as containing the same production well. The sum of the fluid flow ranges controlled by the production wells within each research unit is determined as the fluid flow range controlled by the production wells within the well group.

5. The method as described in claim 1, characterized in that, The determination of the single-well controlled reserves of the production well within the well group, based on the lower limit of seepage conditions and the fluid flow range controlled by the production well within the well group, includes: Based on the physical property distribution characteristics of each flow unit, and according to the lower limit of seepage conditions and the fluid flow range controlled by the production well in the well group, the reserve control range of the production well in each flow unit is determined. The controlled reserves of the production well in each flow unit are determined by the volumetric method, and the single-well controlled reserves of the production well in the well group are obtained.

6. The method as described in claim 1, characterized in that, The lower limit of the seepage condition is determined comprehensively based on the perforation status, geological characteristics, and fluid properties of the produced wells in the reservoir where the five-point method well group is located.

7. The method according to any one of claims 1 to 6, characterized in that, The five-point well group comprises four research units; The five-point well group includes a central injection well and four surrounding production wells, or the five-point well group includes a central production well and four surrounding injection wells.

8. A device for determining the controlled reserves of a single well in a five-point well group, characterized in that, include: The fluid flow range determination module is used to take one production well and one injection well in a five-point well group as a research unit. Two rays are drawn with the production well and the injection well as vertices respectively. The angle between each ray and the line connecting the production well and the injection well is half of a preset angle. A rhomboid range is determined with the two intersection points of the four rays and the production well and the injection well as vertices. This range is used as the fluid flow range controlled by the production well in the research unit, thus obtaining the fluid flow range controlled by the production well in the well group. The controlled reserves determination module is used to determine the single-well controlled reserves of the produced well within the well group based on the lower limit of seepage conditions and the fluid flow range controlled by the produced well within the well group.

9. A computer storage medium, characterized in that, The computer storage medium stores computer-executable instructions, which, when executed by a processor, implement the method for determining the controlled reserves of a single well in a five-point well group as described in any one of claims 1 to 7.

10. A server, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method for determining the controlled reserves of a single well in a five-point well group as described in any one of claims 1 to 7.

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